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# android.accessibilityservice

The classes in this package are used for development of accessibility service that provide alternative or augmented feedback to the user.

An `AccessibilityService` runs in the background and receives callbacks by the system when `AccessibilityEvent`s are fired. Such events denote some state transition in the user interface, for example, the focus has changed, a button has been clicked, etc. Such a service can optionally request the capability for querying the content of the active window. Development of an accessibility service requires extends this class and implements its abstract methods.

An `AccessibilityServiceInfo` describes an `AccessibilityService`. The system notifies an AccessibilityService for `AccessibilityEvent`s according to the information encapsulated in this class.

## Interfaces

AccessibilityService.MagnificationController.OnMagnificationChangedListener | Listener for changes in the state of magnification.
AccessibilityService.SoftKeyboardController.OnShowModeChangedListener | Listener for changes in the soft keyboard show mode.
AccessibilityService.TakeScreenshotCallback | Interface used to report status of taking screenshot.

## Classes

AccessibilityButtonController | Controller for the accessibility button within the system's navigation area This class may be used to query the accessibility button's state and register callbacks for interactions with and state changes to the accessibility button when `AccessibilityServiceInfo#FLAG_REQUEST_ACCESSIBILITY_BUTTON` is set.
AccessibilityButtonController.AccessibilityButtonCallback | Callback for interaction with and changes to state of the accessibility button within the system's navigation area.
AccessibilityGestureEvent | This class describes the gesture event including gesture id and which display it happens on.
AccessibilityService | Accessibility services should only be used to assist users with disabilities in using Android devices and apps.
AccessibilityService.GestureResultCallback | Class used to report status of dispatched gestures
AccessibilityService.MagnificationController | Used to control and query the state of display magnification.
AccessibilityService.ScreenshotResult | Can be used to construct a bitmap of the screenshot or any other operations for `AccessibilityService#takeScreenshot` API.
AccessibilityService.SoftKeyboardController | Used to control, query, and listen for changes to the soft keyboard show mode.
AccessibilityServiceInfo | This class describes an `AccessibilityService`.
FingerprintGestureController | An `AccessibilityService` can capture gestures performed on a device's fingerprint sensor, as long as the device has a sensor capable of detecting gestures.
FingerprintGestureController.FingerprintGestureCallback | Class that is called back when fingerprint gestures are being used for accessibility.
GestureDescription | Accessibility services with the `R.styleable.AccessibilityService_canPerformGestures` property can dispatch gestures.
GestureDescription.Builder | Builder for a `GestureDescription`
GestureDescription.StrokeDescription | Immutable description of stroke that can be part of a gesture.

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